body {
    font-size: 20 px;
}

.bigBox {
    height: 400 px;
    width: 400 px;
    border: 5 px solid #000;
    color: #000;
    > div{
        width:128px;
        height:128px;
        float:left;
    }
    .ani1 {
        background: url('../../assets/imgs/1.png') no-repeat;
        background-size: cover;
    }
    .ani2 {
        background: url('../../assets/imgs/2.png') no-repeat;
        background-size: cover;
    }
    .ani3 {
        background: url('../../assets/imgs/3.png') no-repeat;
        background-size: cover;
    }
    .ani4 {
        background: url('../../assets/imgs/4.png') no-repeat;
        background-size: cover;
    }
}

:root {
    --mainColor: red;
}

a {
    color: var(--mainColor);
}